4 Answers
4

Well, you've to compile it before you try java Subset. This tutorial on creation, compilation and execution of Java source files in command prompt might be of help to you. As a quick update, here's what you can consider doing:

To the down-voter: Can you please explain the reason behind down-voting this? I would love to update/edit the answer based on your comment, but please, when you down-vote , an explanation would be useful!
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SujaySep 4 '12 at 4:04